Why Do Earning Change

List the reasons earnings can change.

[Never_again]

Many of the posts about Adsense earnings dropping appear to often blame some action taken by Google. It seems to me that there are a number of reasons Adsense earning will vary (both up and down) on a specific site, including, but not limit to, the following:

* Existing Adword advertiser meeting budget for the month and dropping out until next month.
* Existing Adword advertiser adjusting their CPC (up or down).
* Existing Adword advertiser dropping “content” sites from their campaigns.
* Appropriate targeted ad inventory become depleted triggering more PSAs.
* New advertiser joins Adword program.
* Your users profile and demographics change.
* Your website topic is of seasonal interest.
* You add or delete content.
* You change the Adsense ad format, color, etc.
* Your page views increase or decrease due to good/bad promotion, PR, linking, search engine position, etc.
* Google changes the programs payout formula.
* Google changes the targeting algorithm.
* Ad apathy sets in with your site users.

I’m sure there are other reasons. Feel free to add to the list.

[clearvision]

Wow...thank you for putting it so cut and dry...if we could keep your list front and center it would sure cut down on "why are my earnings so low" questions :)

Thanks!

[Broadway]

I guess it's incorporated in your list but someone posted a message in these forms once suggesting that earnings variations might be a result of some short term bidding war on a keyword.

They described how in just a few days the high bid might go from say X to 4X or so, just so a person could command that keyword. Evidently after some advertisers have blown through their available money the bidding returns to a more normal level. Makes sense to me.

[FromRocky]

Two more to add:
1. Adsense ads are rotating, not static
2. CPC for these ads under the same topic can vary up to 1000% (example: 10 cents from bottom ad to a top ad of $1.00)

[Never_again]

Good additions FromRocky.

[irock]

Is AdSense crazy? Not whining or anything... it's just that my EPC jumped 46% today. I just couldn't understand why...

[markus007]

mine jumped nearly 50% as well... Its almost as good as it was the first 2 weeks of april, but CTR is pathetic.

[irock]

We are on the same boat...ARGGHH... CTR down 15% whereas EPC skyrocketed 46%. I doubt this will last long given Adsense long history of secret algo experiement.

[JohnKelly]

Today so far EPC up, CTR down, net result about the same revenue here.